Lasts up to 10 times longer than a standard tile drill bit Extremely durable drill head with Bosch Carbide Technology. Hexagonal shank for maximum power transfer on standard three-jaw chucks. Ideal for drilling holes in bathroom tiles, e.g., to install a shower screen, and for drilling roof tiles, without the need for cooling. Easily drills tiles up to a hardness of PEI 5. Scope of delivery: 4/5/6/8/10 mm drill bit set, 5 pieces Lasts up to 10 times longer than a standard tile drill bit. The increase in the size and hardness of wall tiles in recent times has made drilling them very difficult. This specialist drill bit for hard ceramics is designed with Bosch Carbide Technology, the hardest metal, and combines it with a multi-faceted tip design that distributes the workload across several asymmetrical faces. This complex drill tip, achievable through a fine-grinding manufacturing technique, also allows for precise starting without slippage or scoring. The Bosch Expert HEX-9 HardCeramic drill bit is designed for drilling high-strength ceramics without lubricant or cooling. Hexagonal shank for maximum power transfer on standard three-jaw chucks. Technical data: Diameter [mm]: 4.0; 5.0; 6.0; 8.0; 10.0 Total length [mm]: 90 Color: silver + blueLonvre